Nutrition and Health Promotion Center, Department of Public Health, Medical College, Qinghai University, People's Republic of China. Qinghai Provincial Key Laboratory of Prevention and Control of Glucolipid Metabolic Diseases with Traditional Chinese Medicine, No. 16 Kunlun Road, Xining 810008, People's Republic of China. Department of Epidemiology and Health Statistics, School of Public Health, Capital Medical University, Beijing 100069, People's Republic of China. Beijing Municipal Key Laboratory of Clinical Epidemiology, No. 10 Xitoutiao, Youanmenwai, Beijing 100069, People's Republic of China. The First Affiliated Hospital of Xi'an Jiaotong University Public Health Institute, Global Health Institute, School of Public Health, International Obesity and Metabolic Disease Research Center, Xi'an Jiaotong University, Xi'an 710061, People's Republic of China. China Population and Development Research Center, No. 12 Dahuisi Road, Beijing, 100081, People's Republic of China. WHO China Representative Office, No. 23 Dongzhimenwai Street, Beijing 100600, People's Republic of China. Health Sciences Institute, China Medical University, No. 77 Puhe Road, Shenyang North New Area, Shenyang, Liaoning Province, People's Republic of China.